What is the meaning of the following traffic sign?

- Dangerous descent ahead.
- Right curve followed by left curve ahead.
- Correct answer: Winding road.
- Instruction sign – hairpin curve.
Why this is the answer
The correct answer in the official bank: Winding road.
A red-bordered triangle is a warning sign, not an instruction sign. The line bending back and forth several times warns of a road with a series of consecutive bends, so slow down in advance and keep to your lane. The sign for a right curve followed by a left curve shows only two bends, and the dangerous descent sign shows a slope.